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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135db746b0fc94021662733b45d97d44808f1a107ef62964e3ea3e84885f25ee' 
  AND token = 'jbBex9z7VEiIAHOERLxUwsEZCa5XIKHMHyfUnctapyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}